/* LFG Project Website - Tensor-Touch Inspired Design */

:root {
    --accent: #3478f6;
    --accent-light: #5a9cff;
    --text-primary: #111;
    --text-secondary: #555;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-gradient: linear-gradient(135deg, #ffffff 0%, #8fbae0 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --sidebar-width: max(18vw, 160px);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-gradient);
    min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: linear-gradient(180deg, #ffffff 0%, #c9dff2 100%);
    border-right: 1px solid #d0e3f0;
    padding: 2rem 1rem;
    z-index: 100;
    overflow-y: auto;
}

.nav-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-top: 1rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--accent);
    background: rgba(52, 120, 246, 0.08);
}

.nav-link.active {
    color: var(--accent);
    background: rgba(52, 120, 246, 0.12);
    font-weight: 600;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    padding: 2rem 2rem 4rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.main-content > * {
    width: 100%;
    max-width: 900px;
}

/* Title Section */
.title-section {
    text-align: center;
    padding: 3rem 0 2rem 0;
}

.paper-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.gradient {
    background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.lfg-title {
    background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.paper-subtitle {
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.conference {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

/* Authors */
.authors {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1.5rem;
    margin-bottom: 0.75rem;
}

a.author {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a.author:hover {
    color: var(--accent);
}

.author sup {
    font-size: 0.7rem;
    color: var(--accent);
}

.affiliations {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1.5rem;
    margin-bottom: 1rem;
}

.affiliation {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.affiliation sup {
    font-size: 0.7rem;
    color: var(--accent);
}

/* Affiliation Logos */
.affiliation-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    margin-bottom: 1.5rem;
}

.affiliation-logo {
    height: 45px;
    width: auto;
    object-fit: contain;
    opacity: 0.85;
    transition: opacity 0.2s ease;
}

.affiliation-logo:hover {
    opacity: 1;
}

/* Contact */
.contact {
    text-align: center;
    margin-bottom: 2rem;
}

.contact a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

.contact a:hover {
    color: var(--accent);
}

/* Links */
.links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.link-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.link-btn:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.link-btn.disabled {
    background: #ccc;
    color: #888;
    cursor: not-allowed;
    pointer-events: none;
}

.link-btn svg {
    width: 18px;
    height: 18px;
}

/* Teaser Section */
.teaser-section {
    margin: 2rem 0 3rem 0;
}

.teaser-image {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.figure-caption {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.figure-caption strong {
    color: var(--text-primary);
}

/* Content Sections */
.content-section {
    margin: 3rem 0;
    padding-top: 1rem;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--accent);
    display: inline-block;
}

.section-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Abstract */
.abstract-text {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 1rem;
    text-align: justify;
}

.abstract-text strong {
    color: var(--accent);
}

/* Method Image */
.method-image {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-bottom: 1rem;
}

/* Results Container */
.result-container {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.cycling-display {
    position: relative;
    cursor: pointer;
    border-radius: var(--border-radius);
    overflow: hidden;
    background: #000;
}

.result-image {
    width: 100%;
    display: block;
    border-radius: var(--border-radius);
    transition: opacity 0.3s ease;
}

.cycling-label {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
}

.scene-selector {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.scene-btn {
    padding: 0.5rem 1.25rem;
    border: 2px solid var(--accent);
    background: white;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s ease;
    color: var(--accent);
}

.scene-btn:hover {
    background: rgba(52, 120, 246, 0.1);
}

.scene-btn.active {
    background: var(--accent);
    color: white;
}

.frame-selector {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

.frame-group-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-right: 0.25rem;
}

.frame-group-label.future-label {
    margin-left: 0.75rem;
    color: #dc2626;
}

.frame-btn {
    padding: 0.5rem 1rem;
    border: 2px solid #ddd;
    background: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.frame-btn.current-frame {
    border-color: #3b82f6;
}

.frame-btn.future-frame {
    border-color: #dc2626;
}

.frame-btn:hover {
    opacity: 0.8;
}

.frame-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.frame-btn.current-frame:hover {
    background: rgba(59, 130, 246, 0.1);
}

.frame-btn.future-frame:hover {
    background: rgba(220, 38, 38, 0.1);
}

.frame-btn.active.current-frame {
    background: #3b82f6;
    color: white;
    border-color: #3b82f6;
}

.frame-btn.active.future-frame {
    background: #dc2626;
    color: white;
    border-color: #dc2626;
}

.result-note {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Tables */
.table-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 2rem 0 0.5rem 0;
}

.table-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.table-wrapper {
    overflow-x: auto;
    margin-bottom: 0.5rem;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.results-table th,
.results-table td {
    padding: 0.75rem 1rem;
    text-align: center;
    border-bottom: 1px solid #eee;
}

.results-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

.results-table td:first-child {
    text-align: left;
    font-weight: 500;
}

.results-table .highlight-row {
    background: rgba(52, 120, 246, 0.08);
}

.results-table .highlight-row td {
    color: var(--accent);
}

.table-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* BibTeX */
.bibtex-container {
    position: relative;
    background: #1e1e1e;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    overflow-x: auto;
}

.copy-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background: var(--accent-light);
}

.bibtex-code {
    margin: 0;
    font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    color: #e0e0e0;
    white-space: pre;
}

/* Footer */
.footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid #e0e0e0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer a {
    color: var(--accent);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1100px) {
    :root {
        --sidebar-width: 160px;
    }
}

@media (max-width: 900px) {
    .sidebar {
        display: none;
    }

    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 1.5rem;
    }

    .paper-title {
        font-size: 2rem;
    }

    .paper-subtitle {
        font-size: 1.1rem;
    }

    .authors {
        gap: 0.25rem 1rem;
    }

    .author {
        font-size: 0.95rem;
    }
}

@media (max-width: 600px) {
    .paper-title {
        font-size: 1.6rem;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .links {
        flex-direction: column;
        align-items: center;
    }

    .link-btn {
        width: 100%;
        justify-content: center;
    }

    .frame-selector {
        justify-content: center;
    }

    .results-table {
        font-size: 0.8rem;
    }

    .results-table th,
    .results-table td {
        padding: 0.5rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.content-section {
    animation: fadeIn 0.5s ease-out;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #aaa;
}